David G.

If you like Tetris, this IS THE site. Many different single and multi-player modes are available, and my favorite feature is the missions, which enable you to target certain skills, such as T-Spins or Combos or Tetrises. It uses a game format that tracks badges, etc, like Kahn Academy. Very well done! :D

This site allows you to play brain games that target mental weaknesses and exercise these weaknesses via games allegedly designed to promote neural growth in areas of cognitive weakness. They have specials and gift packages as promotions, but I simply play the 15 minutes of free games everyday. It uses a game format that tracks your score over a period of time, which adds a dimension of analysis that I find viscerally satisfying, to the experience. I especially like the Rain Drops (math multiplication and division fast paced exercise) and the game where you are a waiter at a restaurant and must remember guest names over multiple visits to the site, and their orders. It has help me to remember names :)

This site is excellent. I am an extremely fast typist, and, although primarily Indian tutors are those with whom I speak, they mostly type very quicly, speak English very well, and understand every calculus problem I present to them. The benefit of using an online tutor compared with face-to-face is that I am not embarassed to be myself, and ask even the most stupid, trivial questions. I am quickly become more confident and at ease learning than I can ever remember being. I use a face to face tutor also, but this is AMAZING because 24 hours a day I can jump on and get answers to questions that pop up and it would otherwise be too late to get the answers for. I HIGHLY recommend this service. Best part of this: 125.00 / month for UNLIMITED 24 hours a day tutoring in all my subjects. Perfect! :)